Smoother Idle Wanted ... and less lights

Hi. I have a couple issues with my fathers 95 Gran Prix and wanted to see if anyone here had some ideas or suggestions.

Heres the info I know about the vehicle.
1995 Pontiac Gran Prix
about 135,000 miles
I think its the 3.1 V6 but not sure. If someone can translate the VIN I can tell that way.

The problems we're having might be related, I'm not sure. First, I just replaced the EGR valve. When doing so I noticed that it was caked up with muddy/oiling looking goo. Foamy but kinda yellowish brown in color. I cleaned it before and it seems to have returned, but alot less this time. We had the codes taken from it. As I recall we got a EGR fault (thus the change, even thought the pintles seem to move fine) and IAC. I haven't check the IAC yet but the car does idle very grimly. It almost sounds like its going to cut off. His SES light comes on pretty regularly when exiting out of high speed driving (highways) and it kinda hiccups during acceleration to highway speeds.

Unrelated or maybe releated, the low coolant light has been kicking in even though its full. My inital guess is that its just the sensor. But maybe its more...something related to that yellow junk I found in the EGR port.

Thanks in advance

hey man i have a 96 suffering from the same problems only little worse.our egr went out awhile ago.but i posted cause the coolant light.is it low?ours was loosing coolant just very slowly.found a tiny hole right side of lower hose in radiator.

you both have an intake gasket leak, common problem on these cars. The failure rate on GM 3100 factory intake gaskets is something that should have involved a recall, but GM has really good lawyers. Get it taken care of soon, before the coolant gets in the oil and washes out the lower end, or the coolant gets too low, and blows the head gaskets. Also, get me the last 8 of your VIN and I can decipher it for you.

Yeah I see its a 3100. Thing is, his doesn't lose coolant...at all. Didn't see any foaming in the oil or any oil in the coolant expansion tank.

Thanks for the info. I'll keep looking into it.